In psychiatry and psychology, euthymia is a normal, tranquil mental state or mood. People with mood disorders, including major depressive disorder and bipolar disorder, experience euthymia as a stable mood state that is neither depressive nor manic. Achieving and maintaining euthymia is the goal of treatment for bipolar patients in particular.
Etymology
The term euthymia is derived from the Greek words eu and thymos . The word “thymos” had four meanings: life energy, feelings/passions, desire/will, and thought/intelligence; and was also tied to the social dimension e.g. seeking honor from others. A number of other scales, such as the WHO-5, PWB, AAQ-II, CIE, have been developed to also measure the positive side of euthymia.